[Users] Alliance Call reading material on next crowd funder: Zimbra Mailing Lists

[David Sommerseth]

On 08/08/17 10:36, Barry de Graaff wrote:
> Hello All,
> 
> 
> The next alliance crowd-funder, will be about adding mailing list
> functionality.
> 
> I looked into Sympa and Mailman, and while I think integrating these is
> possible
> 
> it would be a rather large undertaking and potentially one that would
> drag on
> 
> for some time.
> 
> Therefore I am thinking about using Zimbra distribution lists and extend
> those with mailing
> list functionality.
> 
> 
> Here is the gist, so we can talk about it during the call:
This looks reasonable as a light-weight mailing list.

However, one of the biggest challenges using Zimbra Distribution Lists
is that it doesn't do anything with the envelope header (Return-Path).
So if I send an e-mail to devel at zeta....org , the Return-Path used when
forwarding the mail to the recipients will carry my dazo at eu....org address.

This will make SPF checks choke, and for those who have "-all" in the
SPF rule and the recipients mailserver is strictly configured to deny
e-mails where SPF fails, those mails never reaches that subscribers
mailing list.

But if the Return-Path was changed to become, for example,
devel at zeta....org, it would be the SPF rules of zeta....org which would
need to pass - which then would be correct.

Now, it is probably possible to so some postfix header-rewrite magic
under the hood.  But ideally, this should happen automatically when
setting up a DL.


-- 
kind regards,

David Sommerseth

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